WAEC Chemistry 2019 Objective — Question 36
Question 36 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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Consider the reaction represented by the following equation: 2SO2(g)+O2(g)↔2SO3(g). A decrease in pressure of the reaction would
- A. decrease the concentration of SO2
- B. have no effect on the concentration of SO2
- C. shift the equilibrium position to the leftCorrect
- D. shift the equilibrium position to the right
Explanation
There are more gas moles on the left (3 mol) than the right (2 mol). A decrease in pressure favours the side with more moles of gas, shifting equilibrium to the left (the backward reaction), in line with Le Chatelier's principle.
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